Creates LonLat object not from longitude and latitude, but from the x/y values of the current projection.

Example

unprojected   = new OpenLayers.LonLat(59.3,17.99); 
mercator      = new OpenLayers.LonLat(2002637.64,8208738.43);

These will mark the point 59.3,17.99 on an unprojected map and the same point on an mercator projected map.